Valve-operating mechanism



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HARRY W. HERMAN, OF CLEVELAND, OHIO.

VALVE-OPERATING MECHANISM.

mamas.

Application filed March 2, 1920, Serial No. 362,765. Renewed February 16, 1922.

T 0 all whom it may concern Be it known that I, HARRY W. I'IERMAN, a citizen of the United States of America, residing at Cleveland, in the county of .Cuyahoga and State of Ohio, have invented mechanisms for the inlet or exhaust valves of internal combustion engines or the like.

The primary object of the invention is to provide an improved valve operating mechanism by means of which a gradual and positive opening of the valve is secured, free from jerks and jars and noiseless in action.

A further object of the invention is to provide 'a' substantially noiseless valve operating mechanism which is of such construction as to automatically compensate for wear which inevitable takes place at the various connections between the members of the valve operating mechanism, means' being also provided whereby manual adjustment may be made for insuring opening and closing of the valve at the proper times even though such wear takes place.

The-invention consists of the features of construction, combination and arrangement of parts hereinafter fully described and claimed, reference being had to the accompanying drawing in which. the figure is a view partly in vertical section and partly in side elevation of the major portion of an internal combustion engine having a valve operating mechanism constructed in accordance with the present invention.

Referring more in detail to the drawing, the presem invention contemplatesan improved valve operating mechanism for internal combust on engines of that type which usually embody a cylinder 5 having a piston 6 reciprocable therein which is operatively connected hy a piston rod 7 with a crank shaft 8 whereby, when said piston,is reciprocated, rotation is imparted to said crank shaft. The engine also embodies the usual shaft 9 which is provided with a cam 10 engaging the roller 11 upon the lower end of the push rod or .pitnian 12 for raising the latter upon rotation of the shaft 9, said shaft 9 being geared to the crankshaft 8 in the usual or any preferred manner so as to obtain rotation of said cam shaft 9. The upper end of the cylinder 5 Specification of Letters Patent.

nut 2i which carries the sleeve 25.

llratcntcd Aug. 29, 1922.

Serial No. 537,122.

is provided with the usual scat 13 for the valve 1% which is nor-mall heldagainst said seat in the usual manner bv means of a spring l5v which encircles the stem 16 of the valve 1 1 and bears at one end upon the top of the cylinder 5 and at its other end against the washer or similar device 17 which is fastened upon the outer end por tron of the stem 16. A bracket 18 is carried upon the head of the cylinder 5, and a rocker arm or operating lever 19 is pivoted upon the upper end of this bracket intermediate its ends as at 20, one end of said rocker arm 19 being engaged as at 21 with the upper end of the valve stem 16 in the usual way and theother end of said rocker arm 19 being operativel} connected to the push rod '12 so that when the cam shaft 9 is rotated the valve 14 is moved to and from its seat in the well known manner. The construction so far described is substantially that which is commonly used .in internal combustion engines in use at the present time.

The present invention contemplates the threading of the upper end of the push rod 12- as at 22 for a material distance for screw threaded reception of the locking nut 23 and the nut 24 which is superimposed thereon, said nut 2i being provided with an upstanding rigid sleeve L5 surrounded at its base with an annular enlargement 26 which provides a shoulder 27 adapted to function as will presently become apparent. An inverted cup QSsnugly telescopes onto the sleeve 25 and is of such length as tohave its lower edge lie slightly spaced above the shoulder 27. the parts being normally yieldingly retained in this relation by means of a helical compression spring 29 or other equivalent compression member which is arranged within the sleeve 25 and bears at one end against the end wall of the cup 28 and at its other end upon the top of the A morn-- ber such as a ball 30 is rigid upon the upper end of the cup 28 and is engaged with the adjacent end of the rocker arm 19 to provide a pivotal connection at this point, the ball 30 being indicated as cooperating with a socket 31 formed in the adjacent end of the rocker l9. Obviousiy the spring 29 is of less strength than the spring 15 which seats the valve 14.

in operation, the engine is started in the usual manner to obtain rotation of the cam shaft 9. lVith the parts disposed in their normal positions as shown in the drawing, the cam lO'moves around and causes upward movement of the push rod 12 and the nut 24 together with its sleeve 25, whereupon the spring 29 is compressed for grant ually allowing the shoulder 29 to come into engagement with the lower edge of the cup 28. The cup 28 is then forced upwardly so as to rock the arm 19 upon its pivot and to force the stem 16 downwardly against the action of the spring 15 so as to unseat the valve 14. When the cam 10 moves past the roller 11 the spring 15 is allowed togradually raise the stem 16 so as to reseat the valve 14 and return the rocker arm 19, cup 28, sleeve 25 and push rod 12 to their normal positions and relationship. This provides an easy. gradual and uniform valve opening motion. free from shocks, jerks and jars. and preventing the valve from chattering on its seat as well as taking up all ordinary lost motion due to wear.

From the above it will be seen that the spring 29 insures engagement at all times between the roller 11 andcam 10. between the ball 30 and the adjacent end of the rocker arm 19 and between the stem 16 and the other end of said rocker arm. Should wear take place at any of these points the spring 29 will automatically separate the. members 26 and 28 so as to compensate for this wear and maintain the above mentioned contact, while the nut 24: may be screwed outwardly of the rod 12"'tot'h desired adjustment and there retained by the lock nut 23 so as to maintain at all times the same relationship between the shoulder 27 and the lower edge of the cup 28 for insuring at all times opening and-closing of the valve 14 exactly when proper.

From the. foregoing description. it is believed that the construction and operation as well as the advantages of the present invention will be readily understood by those skilled in the art.

Minor changes may be made without departing from the spirit and scope of the invention as claimed.

It is to be understood that a rubber or sheet metal member may be easily employed to perform the function of the spring 29, and it is therefore desired that the terms 'of the claims be construed sufliciently broadly to have such interpretation placed upon the same.

What I claim as new is 1. In a valve operating mechanism for engines, a slidably mounted push rod. an operating cam for said push rod, a pivotally mounted operating lever, a spring seated valve having a slidably mounted stem pivotally associated with one end of said operating lever, an inverted cup pivotally associated with the other end of said operating lever, a sleeve adjustable longitudinally on one end of said push rod and snugly slidably telescoped into said cup, and a compression spring within said sleeve yieldingly maintaining constant contact between the push rod and its said operating cam.

2. In a valve operating mechanism for engines, a slidably mounted push rod, an operating cam for said push rod, a pivotally mounted operating lever, a spring seated valve having a slidably mounted. stem pivotally associated with one end of said operating lever, an inverted cup pivotally associated with the other end of said operating lever, a nut adjustable longitudinally on one end of said push rod and having a coaxially rigid sleeve thereon snugly slidably telescop d into said cup, a compression spring within said sleeve yieldingly maintaining constant contact between the push rod and its said operating cam, and an external shoulder on said nut arranged to engage the lower edge of said cup upon compression of said spring and predeterminedmovement of the sleeve into the cup, whereby the valve will be positively opened.

3. In a valve operating mechanism for engines. a push rod, an operating cam therefor, a pivotally mounted operating lever, a spring seated valve having a stem, one end of said lever having contact pivotal connection with said valve stem, an inverted cup having contact pivotal connection with the other end of said lever, a sleeve adjustable longitudinally of one end of said push rod 100 and snugly slidably telescoped with said cup, and a compression spring within said sleeve yieldingly maintaining constant contact betweenthe valve stem and the operat ing lever, between the operating lever and 105 the cup, and between the push rod and its said operating cam.

4. In a valve operating mechanism for engines, a push rod. an operating cam therefor,

a pivotally mounted operating lever, a spring 110 seated valve having a stem, one end of said lever having contact pivotal connection with said valve stem, an inverted cup having contact pivotal connection with the other end of said lever. a sleeve adjustable longitudinally 115 of one end of said push rod and'snugly slidably telescoped with said cup, a compression spring within said sleeve yieldingly maintaining constant contact between the valve stem and the operating lever, between the 0p- 120 erating lever and the cup, and between the push rod and its said operating cam, and means to limit movement of the cup and the sleeve one within the other upon compression of said spring, whereby the valve will be 5 positively opened.

5. In a valve operating mechanism for engines, a push rod, an operating cam therefor, a pivotally mounted operating lever, a

spring seated valve having a stem, one end I of said lever having contact pivotal connec- 'tion with said valve'stem, a'member having contact pivotal connection with the other end of said lever, a second member adjuste able longitudinally ofone end of said push rod, a compression spring between said members yieldingly maintaining constant contact between the valve stem and the operating lever, between the operating lever and the first named member, and between the push rod and its said operating cam, and means to limit movement of said members toward each other upon compression of said spring; whereby the valve will be positively opened. i p

' 6. In a valve operating mechanism for engines, a push rod, an operating-cam therefor, a'pivotally mounted operating lever, a

spring seated valve having a stem, one end of said level-having pivotal connectlon wlth said valve stem, an inverted cup having piv otal connection with the other end of said lever, a sleeve adjustable longitudinally of one end of said push rod and snugly slidably telescoped with said cup, a compression spring within said sleeve yieldingly maintaming constant contact between. the push' HARRY W, HERMAN. 

